This saying too may have originated with Paul himself. In that case, it expresses the believer’s freedom from the Mosaic dietary law (see Mark 7:18–19). But some church members were adapting it to say that sexual immorality is meant for the body and the body is meant for sexual immorality.
In response to this distortion, Paul draws a clear distinction between the stomach and the body. The stomach will be destroyed by God (perhaps an indication that our resurrected bodies will no longer have a need for food). However, the body belongs to the Lord and will be raised by him (1 Corinthians 6:14). Therefore, what we do with our bodies is of eternal significance.
13 “Food is meant for the stomach and the stomach for food” and God will destroy both one and the other. The body is not meant for sexual immorality, but for the Lord, and the Lord for the body.